Aqueous dispersion of sparingly soluble UV absorbers

Abstract

Aqueous stable dispersions of a mixture of sparingly soluble UV absorbers, which comprises (a) 5 to 50% by weight of a mixture of a benzotriazole of formula ##STR1## and a 2-hydroxybenzophenone of formula ##STR2## wherein R is halogen, C.sub.1 -C.sub.12 alkyl, lower alkoxy, lower alkoxycarbonyl, cycloalkyl, aryl, C.sub.1 -C.sub.12 alkylaryl or aralkyl, and the rings A and B, each independently of the other, may be further substituted by halogen, hydroxy, lower alkyl, lower alkoxy or lower alkoxycarbonyl, R.sub.1 is hydrogen, hydroxy, C.sub.1 -C.sub.14 alkoxy or phenoxy, R.sub.2 is hydrogen, halogen or lower alkyl, R.sub.3 is hydrogen, hydroxy or lower alkoxy, and R.sub.4 is hydrogen or hydroxy, (b) 2 to 18% by weight of an anionic compound, and (c) 0 to 10% by weight of a nonionic compound. These dispersions of a mixture of UV absorbers are excellent compositions for enhancing the lightfastness of dyeings on synthetic fibers and, in particular, on polyester fibers or acid-modified fibers.

Dependencies are inferred from the claim text.